Add hex encoding

Author: pennam

src/Arduino_HEX.h

@@ -0,0 +1,12 @@
+/*
+    This file is part of the Arduino_CloudUtils library.
+
+    Copyright (c) 2024 Arduino SA
+
+    This Source Code Form is subject to the terms of the Mozilla Public
+    License, v. 2.0. If a copy of the MPL was not distributed with this
+    file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*/
+#pragma once
+
+#include "./hex/hex.h"

src/hex/hex.cpp

@@ -0,0 +1,26 @@
+/*
+    This file is part of the Arduino_CloudUtils library.
+
+    Copyright (c) 2024 Arduino SA
+
+    This Source Code Form is subject to the terms of the Mozilla Public
+    License, v. 2.0. If a copy of the MPL was not distributed with this
+    file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*/
+
+#include "hex.h"
+
+namespace arduino { namespace hex {
+
+    String encode(uint8_t* in, uint32_t size) {
+        String out;
+        out.reserve((size * 2) + 1);
+
+        char *ptr = out.begin();
+        for (uint32_t i = 0; i < size; i++) {
+            ptr += sprintf(ptr, "%02X", in[i]);
+        }
+        return String(out.c_str());
+    }
+
+}} // arduino::hex

src/hex/hex.h

@@ -0,0 +1,22 @@
+/*
+    This file is part of the Arduino_CloudUtils library.
+
+    Copyright (c) 2024 Arduino SA
+
+    This Source Code Form is subject to the terms of the Mozilla Public
+    License, v. 2.0. If a copy of the MPL was not distributed with this
+    file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+
+#include <Arduino.h>
+
+namespace arduino { namespace hex {
+    /*
+     * This library contains the methods to get board provisioning id
+     */
+
+    String encode(uint8_t* in, uint32_t size);
+
+}} // arduino::hex